Astro Pneumatic 3/8” Drive Head in 1/4” Ratchet Body Nano Ratchet 93808 The Astro Pneumatic 3/8” Drive Head in 1/4” Ratchet Body Nano Ratchet 93808 is a 3/8” drive ratchet in a 1/4” ratchet size format. The Nano 3/8” head is 50% the size of the most popular 3/8” competition and the same size as the 1/4” drive. 72 tooth, 8” long, quick-release socket retention, solid teardrop handle, and a full chrome polish finish. The Astro Pneumatic 3/8” Drive Head in 1/4” Ratchet Body Nano Ratchet 93808 exceeds ASME torque standards for 3/8” drive tools despite its miniature size.